<title>划分数列</title><link href="http://hzoi.com/tomorrow.css" rel="stylesheet"><div class="ui existing segment"><pre><code><span class="pl-cm">/*</span>
<span class="pl-cm">5 2</span>
<span class="pl-cm">2 1 3 4 5</span>
<span class="pl-cm">*/</span>
<span class="pl-cp">#include</span><span class="pl-cpf">&lt;cstdio&gt;</span><span class="pl-cp"></span>
<span class="pl-cp">#include</span><span class="pl-cpf">&lt;iostream&gt;</span><span class="pl-cp"></span>
<span class="pl-cp">#include</span><span class="pl-cpf">&lt;algorithm&gt;</span><span class="pl-cp"></span>
<span class="pl-k">using</span> <span class="pl-k">namespace</span> <span class="pl-n">std</span><span class="pl-p">;</span>
<span class="pl-kt">long</span> <span class="pl-kt">long</span> <span class="pl-n">n</span><span class="pl-p">,</span><span class="pl-n">k</span><span class="pl-p">,</span><span class="pl-n">a</span><span class="pl-p">[</span><span class="pl-mi">100005</span><span class="pl-p">];</span>
<span class="pl-kt">bool</span> <span class="pl-nf">check</span><span class="pl-p">(</span><span class="pl-kt">long</span> <span class="pl-kt">long</span> <span class="pl-n">maxh</span><span class="pl-p">){</span>
	<span class="pl-kt">long</span> <span class="pl-kt">long</span> <span class="pl-n">i</span><span class="pl-o">=</span><span class="pl-mi">0</span><span class="pl-p">,</span><span class="pl-n">nsum</span><span class="pl-o">=</span><span class="pl-mi">0</span><span class="pl-p">,</span><span class="pl-n">sepai</span><span class="pl-o">=</span><span class="pl-mi">1</span><span class="pl-p">;</span>
	<span class="pl-k">while</span><span class="pl-p">(</span><span class="pl-n">i</span><span class="pl-o">&lt;</span><span class="pl-n">n</span><span class="pl-o">&amp;&amp;</span><span class="pl-n">sepai</span><span class="pl-o">&lt;=</span><span class="pl-n">k</span><span class="pl-p">){</span>
		
		<span class="pl-k">if</span><span class="pl-p">(</span><span class="pl-n">nsum</span><span class="pl-o">+</span><span class="pl-n">a</span><span class="pl-p">[</span><span class="pl-n">i</span><span class="pl-p">]</span><span class="pl-o">&gt;</span><span class="pl-n">maxh</span><span class="pl-p">){</span>
			<span class="pl-n">sepai</span><span class="pl-o">++</span><span class="pl-p">;</span>
			<span class="pl-n">nsum</span><span class="pl-o">=</span><span class="pl-mi">0</span><span class="pl-p">;</span>
		<span class="pl-p">}</span> <span class="pl-k">else</span> <span class="pl-p">{</span>
			<span class="pl-n">nsum</span><span class="pl-o">+=</span><span class="pl-n">a</span><span class="pl-p">[</span><span class="pl-n">i</span><span class="pl-o">++</span><span class="pl-p">];</span>
		<span class="pl-p">}</span>
	<span class="pl-p">}</span>
	
	<span class="pl-k">if</span><span class="pl-p">(</span><span class="pl-n">sepai</span><span class="pl-o">&gt;</span><span class="pl-n">k</span><span class="pl-p">)</span><span class="pl-k">return</span> <span class="pl-nb">false</span><span class="pl-p">;</span>
	<span class="pl-k">else</span> <span class="pl-k">return</span> <span class="pl-nb">true</span><span class="pl-p">;</span>
<span class="pl-p">}</span>
<span class="pl-kt">int</span> <span class="pl-nf">main</span><span class="pl-p">(){</span>
	<span class="pl-n">freopen</span><span class="pl-p">(</span><span class="pl-s">&quot;sepa.in&quot;</span><span class="pl-p">,</span><span class="pl-s">&quot;r&quot;</span><span class="pl-p">,</span><span class="pl-n">stdin</span><span class="pl-p">);</span>
	<span class="pl-n">freopen</span><span class="pl-p">(</span><span class="pl-s">&quot;sepa.out&quot;</span><span class="pl-p">,</span><span class="pl-s">&quot;w&quot;</span><span class="pl-p">,</span><span class="pl-n">stdout</span><span class="pl-p">);</span>
	
	<span class="pl-n">scanf</span><span class="pl-p">(</span><span class="pl-s">&quot;%lld%lld&quot;</span><span class="pl-p">,</span><span class="pl-o">&amp;</span><span class="pl-n">n</span><span class="pl-p">,</span><span class="pl-o">&amp;</span><span class="pl-n">k</span><span class="pl-p">);</span>
	<span class="pl-kt">long</span> <span class="pl-kt">long</span> <span class="pl-n">sum</span><span class="pl-o">=</span><span class="pl-mi">0</span><span class="pl-p">;</span>
	<span class="pl-k">for</span> <span class="pl-p">(</span><span class="pl-kt">int</span> <span class="pl-n">i</span> <span class="pl-o">=</span> <span class="pl-mi">0</span><span class="pl-p">;</span> <span class="pl-n">i</span> <span class="pl-o">&lt;</span> <span class="pl-n">n</span><span class="pl-p">;</span> <span class="pl-n">i</span><span class="pl-o">++</span><span class="pl-p">){</span>
		<span class="pl-n">scanf</span><span class="pl-p">(</span><span class="pl-s">&quot;%lld&quot;</span><span class="pl-p">,</span><span class="pl-o">&amp;</span><span class="pl-n">a</span><span class="pl-p">[</span><span class="pl-n">i</span><span class="pl-p">]);</span>
		<span class="pl-n">sum</span><span class="pl-o">+=</span><span class="pl-n">a</span><span class="pl-p">[</span><span class="pl-n">i</span><span class="pl-p">];</span>
	<span class="pl-p">}</span>
	<span class="pl-kt">long</span> <span class="pl-kt">long</span> <span class="pl-n">l</span><span class="pl-o">=</span><span class="pl-mi">0</span><span class="pl-p">,</span><span class="pl-n">r</span><span class="pl-o">=</span><span class="pl-n">sum</span><span class="pl-p">,</span><span class="pl-n">mid</span><span class="pl-p">;</span>
	<span class="pl-c1">//printf(&quot;\n%d&quot;,sum);</span>
	<span class="pl-k">while</span><span class="pl-p">(</span><span class="pl-n">l</span><span class="pl-o">+</span><span class="pl-mi">1</span><span class="pl-o">&lt;</span><span class="pl-n">r</span><span class="pl-p">){</span>
		<span class="pl-n">mid</span><span class="pl-o">=</span><span class="pl-p">(</span><span class="pl-n">l</span><span class="pl-o">+</span><span class="pl-n">r</span><span class="pl-p">)</span><span class="pl-o">/</span><span class="pl-mi">2</span><span class="pl-p">;</span>
		
		<span class="pl-k">if</span><span class="pl-p">(</span><span class="pl-n">check</span><span class="pl-p">(</span><span class="pl-n">mid</span><span class="pl-p">)){</span>
			<span class="pl-n">r</span><span class="pl-o">=</span><span class="pl-n">mid</span><span class="pl-p">;</span>
		<span class="pl-p">}</span><span class="pl-k">else</span><span class="pl-p">{</span>
			<span class="pl-n">l</span><span class="pl-o">=</span><span class="pl-n">mid</span><span class="pl-p">;</span>
		<span class="pl-p">}</span>
	<span class="pl-p">}</span>	
	<span class="pl-n">printf</span><span class="pl-p">(</span><span class="pl-s">&quot;%lld&quot;</span><span class="pl-p">,</span><span class="pl-n">r</span><span class="pl-p">);</span>
	
	<span class="pl-k">return</span> <span class="pl-mi">0</span><span class="pl-p">;</span>
<span class="pl-p">}</span>
</cpde></pre></div>